For the granita, place the sugar and 2 1/2 cups water in a medium saucepan on medium heat. Add the lemon and lime peels. Stir until the sugar has dissolved. Bring to a boil; boil for 5 mins. Add the lemon and lime juices. Cool.,Strain into a freezer-proof container; cover. Freeze for 2 hrs until ice crystals start to form around outside edges. Beat with an electric mixer until crystals are evenly combined. Return to freezer for about 3 hrs, until firm. Remove from freezer 10 mins before serving; let stand at room temperature.,______,Mash the granita with a fork until crumbly. Spoon into serving bowls. Serve with kabobs.